This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A099949 #9 Oct 13 2015 02:55:21 %S A099949 1,5,20,84,388,1951,10529,60478,367953,2362503,15955673,113015123, %T A099949 837307541,6473306155,52110629576,435951806195,3783475965645, %U A099949 34007779661168,316120859847935,3034730002671251,30048957645720682,306529788241138211,3217941347005747296,34730178825735671711,384990885899299757336,4379518943963832643173,51083106730348426001558 %N A099949 Number of crossing partitions of n. %H A099949 M. Klazar, <a href="http://dx.doi.org/10.1016/S0097-3165(03)00014-1">Bell numbers, their relatives and algebraic differential equations</a>, J. Combin. Theory, A 102 (2003), 63-87. %K A099949 nonn,easy,nice %O A099949 4,2 %A A099949 _N. J. A. Sloane_, Nov 12 2004 %E A099949 More terms from _Vladeta Jovovic_, Jul 11 2007